Question

a. Define coefficient of friction between the road and the tyres of wheel ?

Answer 1

Co-efficient friction is the amount of friction that is created between the road and the tires of the wheel.

• The friction between the road and the tires of the wheel is known as vehicle traction.
• The electronic systems cannot be used to increase or decrease the traction. It is independent of it.
• Whether the vehicle will slip on the road or not is defined by the coefficient of friction.

Answer 2

The maximum value of the coefficient of friction can’t be greater than 1.

• "Coefficient of friction is generally defined as the ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together."

• It is usually symbolized (μ).

Mathematically,

μ = F/N,

where,

F = frictional force and N = normal force.

• The value of coefficients of friction is generally 0.7 for dry roads and 0.4 for wet roads.
• On dry surfaces the coefficient of friction might get high as 0.9  and on wet roads driving is dangerous as the wet road coefficient might be as low as 0.1 .

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